@article {chryssanthopoulos2005activity,
	title = {Activity questionnaires; a useful tool in accessing heart failure patients},
	journal = {International journal of cardiology},
	volume = {105},
	number = {3},
	year = {2005},
	pages = {294{\textendash}299},
	publisher = {Elsevier},
	author = {Chryssanthopoulos, Stavros N and Dritsas, Athanasios and Cokkinos, Dennis V}
}
